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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138ca93ebec5d6dc954b596204f59ab175a1f2be69252a6e866a5a64fcebc9af' 
  AND token = '1PPsAraiuSdWWlfZiR3+1OV2TYtOdqsC9AeoEAGKaJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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