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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a0d0cd8f75eb0c912c2f329ec2c4306356040cbb22e3492aeac19f3f175628' 
  AND token = 'lDwksdkfeMf9kQWqZSPrKBgFkSfhBU6jh5j09p11msQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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