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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47815c344999694f6551f72d629526472b06b4e1ad652f40a11b4bda20433164' 
  AND token = '/u0V2jlVcC95GGD5/NRpRKeb4hi5fP7eTM2Fg22vk+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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