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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1467eda951548972e975ba89c28c517dff4b558c13ebcc20f7c4660067a708' 
  AND token = 'llRbyRFShW2xjZf2Ros17jNFJM/QzHHjg9kZlrnQ1Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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