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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cae0f69466e2ccc0b84d3b7d12277c85050c31671932075c95b24efb968deb9' 
  AND token = 'FeoS1todTnv9oOGuFcE02ha99IzttI26KIoXJHcpi6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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