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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35aed947c69dd124c4465edc94cf5ee1347be226a5b3e5586d75f05a7fe9e097' 
  AND token = 'WCa1Q02yYs3Nw6jVDFoEYAywSy6Geg2TTTiazNDZw3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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