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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9313cbf4afafdf0e03fa0f123155ee20515a438f5c97aa0aebb7b9249f28c258' 
  AND token = 'yljeicFUWWXVPrvSuWVt8eAqDoykuwHPdYd4SeLyQYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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