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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe8d7669fb6dc1e088498be16e3f876c6b64b7bd1b6ecc64615a0c3636dc76f' 
  AND token = 'QjFGGhkjav8kG6j3qEffprJ4UUo/+WXbi3SILUa3k34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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