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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc239d63a5bae43bc5fdda94eb7c3d6c06f991c4f365eaa8b7e7878ceba7990' 
  AND token = 'PNbKJVkZm46QN5Lxc4G8PjF1pJfNjKbsNHmyjZCyBmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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