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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5477e33225b58c94368e8ee9a1c14f34313d375d7b5a6df6cf5bc35b4ffe219e' 
  AND token = 'DrXles9oLc1rw2vK7OcO3QxWSnZEf1f3SonSrz+FJCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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