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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8433be54c97f629e4de3190d7a64b5d86f91f602be54af58885b4a70e72105' 
  AND token = 'jqrjM9m/Ovti9Zpi/9ktcPBCjaBaUN+JBP58mpFodxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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