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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9bd7baa38a38ae16a1b29d8a67a62423787b5c3b0213127443128fd4cb6ff7' 
  AND token = 'lOQ0ZF5JTkhF93jp3hy2bRck2wOJtNUq7gMzBRxB+7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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