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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020f591b6b2e9137fcdc49cf16e45faf8b9db530dd28dbba563d665948045775' 
  AND token = 'AjB3gesyHpefukoOgHrP7iBUqEabTieM+2kmLANqNVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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