SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58053891626605bff6d4990e31acd3b5f4d968829d7414386c2c6a2720ec8776' 
  AND token = 'HyexIeZvvnIuB/7CJczYxtvJIGX/ebxnDBOQvgprIOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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