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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593a920d2d7b5f1de0469b9cb589638abbd3b59a8054e16d5415803e8fa1e9f4' 
  AND token = 'c/cMuw5Rim7l3DzbivgWiUDjCrd69cqI3k5ecxtLBTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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