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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c1626271095793846249a7ce4db47ccc463b377b0b7fda7ec658569bd10235' 
  AND token = 'pBFZ345/FCfPcoWfhCmdA+xwrNJ3egBceu7XUli5zxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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