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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d242bd035ead6e252a872f18ed84636e9053be073ddab033525014b8fc4cad' 
  AND token = 'RQhVaGQHflLP5C2h5lm1eXvcHj8xK5lTfcWKpON/9nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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