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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee62a9b7c83326b8d06754a09895ce641584d533ae4b9e392ceaeb5eb5e911d2' 
  AND token = 'oSHOd6efiJ4oqxewlA0UZQa5xIfSzeRDbXez4b27ZjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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