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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9079bc6d8d042adf97927d4436c3cc28404e321d044103444da896fc411a4a7' 
  AND token = 'tXLe2CltE6XriKXxMYRKgqK5k4eU6l+W6PNZ+iM4XjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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