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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca1603c6af223ce6005cecdeed48f7fca732564d7458918febe22b06cf993ee' 
  AND token = '9XQ2Yr1jgbptp0INz9ZkeM6pyArEra2UeI5CeocsaVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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