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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573b7f8108fdba8c13fca3ca59580a41054c97c4e72bd8552ca005bbee2480f1' 
  AND token = 'nAxh+9NTdkHiGdxv8Nz7daJonMGQM2Cy9PsNAuXaTb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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