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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9935a4137083a0055676d64e2e6495ebdd2f4a14a7af3a35a7d5c144149a95' 
  AND token = 'jwkTLxLrasSmquqAyZjVnMn0d0CTj8cGoDn+4sExTRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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