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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccc54b6c47b51105b65259abb45bea5d93892c4ccbfd17e8de43ef0d8547245' 
  AND token = 'mzHw3FQ2kCr9u40LjA8qPwfATMdcfX4HefzXAPimnbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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