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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8423cfe8d1afc76e8c937a73295240b331bcb84460d7a8a437708e4e47c1e7f' 
  AND token = 'aXHtojOOR6csTLuHQqCICd5Mo3eEcuRb+/A29E6788w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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