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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ddfdb221aa22129c7aaea037fdb920fa7ad73640ef34cd89674d6e6bc7174a' 
  AND token = 'XQHBZLpfcl2TqE7PZ3FxubtzKHz3oQ2OupGawyEjkpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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