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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83bd2c4415aad301c21a8d86dc884dd2c7d0e9b85b8483e5e68f0b36c69e1cc' 
  AND token = 'ZB+e5D5SnVPK4dQZ6oDvSeKnvIIJ3kajfDyqogrbOQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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