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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aac8918b8ed5bb3fb6c76f8b6dbde24aa58fbd7cb3d8842140a0de1d8a60446' 
  AND token = '1QzfkQDj8dQOK8iVe/WuJ3jD9HXLAaGJ+l2ln3TWSx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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