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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1f51f7658b00a6a54fe9df3a8899fa1d2f3160c470c1e66e2dec9d59c20f95' 
  AND token = 'jt3M6QYxdVpq0kfwRIO0Pg4Yqh9j+tpyE9qrS94V3ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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