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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4db9058f52be286e8e66cb7ef1ce793d2add0698567f61aafccb2eae322a916' 
  AND token = 'lxggUvRtoAqllyZ1nWNglXvfDV9LB/VPpoNcmmBKOpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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