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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18609bed4ab4249f6d9f9b6cc33b17b6d7d551898525f24b985b304cfb25281' 
  AND token = 'EwkM/4xNkQsn4nA7cUtdqxltDt7Oebb0tPAJhKglcZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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