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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45725a11bf3e03dd190e9d5e7f9f5d976c9ed8de6cb5cf674b36fd7dd9e1758a' 
  AND token = '4oQUGcG6i+jKW/+juiJsFbLlShNhcWBRoQImHBe2eOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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