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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac32576569b619462cb4cfde6c12cf7a7e99455211459d70bf4aa4dc21521336' 
  AND token = 'BpJ5syroH8Q15yGUA71wiCen3IGVPR5cS9ia0A9bjCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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