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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5334cf537bd173cad65d0c578e748a15e60f304499f37b221b49b9c33d7d34' 
  AND token = 'F8ucDCiJ01oopXaCodUKkVj3J53mJEDpjx9unGTdY7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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