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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fa1d12febc34467f6741ebd8b4a15be9f51715eb8294092f939c135a9d4873' 
  AND token = 'vm53t1HjtiiZ/ZKc84YRVB2ocm7EAI3+R1m0adlGp7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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