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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc1ce7da61ac65ae7d9bf6894b70430ce5bb3cddc7bd406f6dcd3febade4f21' 
  AND token = 'PoQ9L/h2gOfyu9f7AKqx4QMVu8jIYrRc8Ic22/YakjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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