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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75be2f34f58b1855ddb457a9696339c36909abfa48f1614b7215573baba604c' 
  AND token = 'cikF4eMASC2w4f8w7cf03su+EKdm4b1ZSDfb0oKtA3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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