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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6007b45db7eb9aed6843fa883d4868cb11ce096659245b3c633bd195ee1eec68' 
  AND token = 'JnxFg0jZ+gNmwWT1Mk5lxblM335QGjtTeGC0MYhakwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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