SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b386679d9d3f912aa1b1e7ff1eb1aeff587cef0a0a3df9a34126ba185cb820' 
  AND token = 'VMnn2ARBR7wtmSFDfVSwVCuC/9jvhVuZO4bypiNOHWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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