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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844017bc503cbee7e76e28f1cc3495c7cd3d7f1becd17ef79b1340257e43176f' 
  AND token = 'farFAhSdbAFuznZFeJ6BF/g53Hp3LH1MTUoRC7FbUjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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