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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f10488870dfde2cffb91ebbdbac7925880b76cfa2b43dcc0046a99cfb4c480' 
  AND token = 'CFSk90V/g2dyw8YaCqp/IJ+wTH1dL2pzlDnlcTeAW54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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