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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f6d7177a9d927d341af450b5c38bf2b295ed1d19c7f34371e105b2125815a7' 
  AND token = '3kzbRnVHIm5ZNUg/cSRSAPiDC/QheEwPWqc1rqQba5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}