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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54821bf0ebe553e8aa8ed3a6389856fdb0467a6332f7e734e7108c925cebdb68' 
  AND token = '6X99xWH+0frBAopV7llB3PBGp0Az6302uyhc2MaAZn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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