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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014e0d04f147f43342d128544095badb52a6d39afc9fb0c14a943fbbf4d8f53e' 
  AND token = '/idULJ6ElLB2yaXzT99EGjOlUT32h4LKh6W0jDqdC3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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