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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2209d366da3361d04ed31065f09a934466c43b53d9146cea19fa8cc70d883555' 
  AND token = 'yN1lzsLFDC6PelSW7gis6ALYBK7pFcP/EnEvYBhGX8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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