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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7782513f0ba38ad3052c13fe40d305d3035600b02e89de4c75ec183d44c46091' 
  AND token = 'G9qoGqVuP4Qbl9tQtx5XcYB7HTJIHqeVuarSV81Jamg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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