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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85321b773bcc19f1d071cd450dfab7c8e56acbdb2a43c2a75ff9f8452b7d803b' 
  AND token = 'XDDM3oyrvWkYMb25BI3g7WgDGpH1j0iY5k7Tp5Dw0Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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