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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9822ebb4740fce398a5b258d4230b35d36b5a13ede3eaa6f4e79690860718db' 
  AND token = 'Fzlbiz7onHqB5jPCfK/RiT0d0clFT6d9ldumv1gyifE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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