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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a5f9b9e005798e814c023152784e261a534f53011b90de120ebb76dd60d343' 
  AND token = 'cTAQ9WVgqH9ubl5p1CdKyurH0KSR4YSUq9iQRQ6UIyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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