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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70c7a41738b1597957ba66fd832ab708c2e8fac7fc906acc9c9f7343b6cd6c4' 
  AND token = '4jsnnFZBdXg9uu8UYWnTOqDdwCC08NkQgCKgMk07Hh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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