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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92424189a347cf380d1a9c4ae620fde7dffdda58feb21148b8804e7c629a4eba' 
  AND token = 'sDFjtChY2T2pywPeLhW4xmzWJVoQhKt5DxfhVpJP9Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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