SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028b63c28f14d54725bfa9b05907c16b2f4fa54feff6cfe7b58ef8927c67a581' 
  AND token = 'tPKZndvH3gB0VAdYjuf4AMsMLGjp1sNXHm+1s+L5Uvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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