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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e649789dc8711310e4a79555d4085b4cf79ab852ba326e6eeb0c8de60a713a' 
  AND token = 'vAqvUCf3jg8u7KVk2uSGtKQbUAK5TqYEW2Lk1ENS6yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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