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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee1dea5b6783c55ae347bc47baea4b68c9345a0f148aa71c19ae6a76c935bed' 
  AND token = 'ssGkj/oERlxEl+ThHqB71VMoSdn6cTWKRqvJqKud71k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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