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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5dea04fd3006f8458152fa1ddb0508caf323a94c4e7854b84e1136c0fa5eaa' 
  AND token = 'J8ImHGI190qIVx8LgHpcwHtXPFKrH9QVsweVmOoKW4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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