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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d5fff4d2ddfe3000d3e27ca8fa245cddd5ce64a6c91a267a545419e21313ba' 
  AND token = 'aMbf0G3453bBfdfXYZQ4KR9QmCxgrZDiOPCS68iTF8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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