SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44988401ddd96c05133772ff8615011d123df2997d8c3236f5e5f6b3b65b92e' 
  AND token = 'i/+8Tzp4Z25nhq2+wAXAUuCGxufltT1GmiZpKNxTdF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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