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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fe9894bb8b67ffffd55bad1837e7d596a9633048947945bc69ac2b7deec6de' 
  AND token = 'AfNxtoHykYRtlpMR5igt8S+Dsv1V/IFbKGpiJMmg7RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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