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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d2a6f7ae00875a1f29f6debac08453aa657f4733fe44c2fef7ea97519e6304' 
  AND token = 'N3e4Ll7bzK5dCbSqPbh4MhO5emefNq6MffEFzRlg/XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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