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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db19991df282b80c34dcb108ca46fafa39d7be5b487963ca468cb053fae5d5a' 
  AND token = 'gyso+q8pOaNIXznnHhAJU/0133LJd3+juZP2/EY9IbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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