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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76152a5952cd2c37b76dbf069425ecba8a2f50ce1b9132b5549b5923e7a0cc6' 
  AND token = 'vzjZt6J4Ftrq1m04P2MTR9oduEDhXueqW05C/m45DgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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