SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c09f54ebcf861f56574492a60a82a8e13f2281865047c3f38b44b3baf58e43b' 
  AND token = '2GqXfzWtJvikKk/T2AseVVC2+gwY54xFYeHt41tIzK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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