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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8c56b49590bf34e35a4f5e98930d168fd8eff7ea9d146e2cce756897046611' 
  AND token = 'iKICU169Xp9WQYtbWleOIAgg0pOKhYRgnWx+g+4EYWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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