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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66e70beffeb0f159b980450f8760fe7477dbb32cc1b37765efd199c14e15226' 
  AND token = 'OuCYy7C5cVpywgAySbwEOVZLHW+H5ahDHQh7LXH2VHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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