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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e9f82234f3d27718844cf276147d204011b71bc9ec994700693d5f224987c9' 
  AND token = 'ARTzUPWJ6OfHGzc0zvCruKmnF3cxDSkCEBNghe3aj40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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