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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4817119c204d46888c1702cb1cd69b55c90f8df5fd6608475b3257f94dbe10' 
  AND token = 'ER5ePuUYsZc5q8Qj64QD2wcutXx1E46y/6wzBWfPQoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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