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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54cdd156bfcf1fd4ae394db021defc2e1210a8c92ca376810e3ef4bd4441f0c9' 
  AND token = 'zrGqs3Yx2kuh2Ke6KAuLu897KafvpHVLn8FPQgpSiWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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