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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb1e68d9a262695f4a7f1763c85cd9104b13a134e3009654d333f3d69030ac3' 
  AND token = 'DcTXu9oBrwth9RmNrjCq3YBjoRAs0aX/TqL0TwVK9aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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